Hello, am sorry for your loss.
I saw my son after he died - immediately after, when he looked just like himself, and then when he was in his coffin when he looked nothing like himself. I have been able to 'wipe away' the image of his face then as I only looked at him for a very short time.
However, I would have regretted not seeing him that last time if I had not done it.
I agree with campocaro that seeing your loved one in death is very difficult and does haunt me in a way, but the very fact of his death haunts me, so having seen him is just a part of that.
I suppose what I am trying to say is my advice based on my experience would be to go and see him, but to be ready to only have a short visit if you feel he is too changed. When I saw my son as well I had a profound feeling that it was not him: what made him 'him' was gone.
I would be very wary of thinking that seeing your husband will give you any kind of 'closure'. I am not sure you can get 'closure' when a loved one dies, especially when it is out of the blue - the shock and disbelief can last for a long time.